What specific name can be given to the following sequence of steps:
`Hg+hv rarr Hg^(**)`
`Hg^(**) + H_(2) rarr H_(2)^(**)+Hg`

Options

A. Fluorescence
B. Phosphoresecence
C. Photosenistization
D. Chemiluminescence

Answer

To solve the question, we need to analyze the given sequence of steps and identify the specific name that can be attributed to it.

### Step-by-Step Solution:

1. **Identify the First Step**:
- The first step is represented as \( \text{Hg} + \text{hv} \rightarrow \text{Hg}^{*} \).
- Here, mercury (Hg) is being excited by light (hv), which indicates that it is absorbing energy from the light source.

2. **Identify the Second Step**:
- The second step is \( \text{Hg}^{*} + \text{H}_{2} \rightarrow \text{H}_{2}^{*} + \text{Hg} \).
- In this step, the excited mercury (\( \text{Hg}^{*} \)) reacts with hydrogen (\( \text{H}_{2} \)) to produce excited hydrogen (\( \text{H}_{2}^{*} \)) and regenerate mercury.

3. **Determine the Type of Process**:
- The process involves the absorption of light energy and the subsequent transformation of reactants into excited states. This is characteristic of a photochemical reaction.

4. **Specific Name for the Sequence**:
- The entire sequence can be classified under the term **photosensitization**. This term refers to a process where light energy is used to excite a substance, which then participates in a chemical reaction.

### Final Answer:
The specific name that can be given to the following sequence of steps is **photosensitization**.

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